Air and gas compressor.



P. ELDER.

AIR AND GA$ GOMPRESSOR.- I

APPLICATION FILED DBO; 2, 1907.

Patented Sept. 29, 1908.

57 5 5754 s sums-sum 1.

- hwentdz }%oleo I,

4 P. BLDER. 1111 AND s oomrnnsson. AlPL IOATI ON FILED D30. 2, 1907.

Patented 861111.29, 1908.

3 SHEETS-SHEET 2' eluuentoz FRED ELDER, OF VINOENNES, INDIANA.

am AND ens. COMPRESSOR.

Specification of Letters Patent.

Application filed December 2; 1907. Serial No. 404,787.

To all whom it may concern:

Be it known that I, FRED ELDER, a citizen 7 of the-United States, residing at Vincennes,

in the county of Knox, State. of Indiana,"

have invented certain new and useful. Im-

provements in Air and Gas Compressors; and

do hereby declare the following to be a'full, clear, and exact description of the invention, such as will enable others skilled in the art'to which it appertains to ,make and use the same. 1

This invention relates to new and useful lmprovements m an and gas compressors and 1n'1ts broad conception, it comprises a pump for feeding air to a storage tank, the

said pump having inlet valves arranged adacent each end of the cylinder and including a main-outlet valve at the upper end of the cylinder and an'auxiliary outlet valve opening into the cylinder. j 7

In connection with an air compression pump having the above characteristics, the invention aims as a primary object to pro vide a novel construction, combination and arrangement of parts, whereby the pump piston head effects in the two movements a primary and secondary compressing action. The details of construction will appear in the course of the following description, in

of the cylinder.

which reference is had tothe accompanying drawings, forming a art of" this specification, like characters ohraferencedesignating similar parts throughout the severalviews, wherein: v v p Figure 1 is a centrallongitudinalsectional view of an air and gas compression pump constructed in accordance with the present invention. Fig. 2 is a top plan view of the pump, the water jacket 7 eing' removed,

ig. 3 is a section on the line 3-3'of Fig.1, looking in the direction of the arrow. Fig.4

is a bottom plan view. of the upper cylindep ine 55 o head. Fi 5 is a section on the Fig. 1, 100 ing in the directionof'the arrow. Fig. 6 is an enlarged detailed sectional .view of the valves which open into the. upper end Fig. 7' is a section on the line 77 of Fig. 2.

meral 5 designates the pumping cylinder closed at its lower end by a head 6 having a stufiing box 7 through which works apiston rod 8 carrying atits end a piston head 9. The cylinder 5 is provided at its u per end with an annular circumscribing an e 10 which forms the top Wall of opposite y 10-,

rounds the stem of a spring 11 In the accompanylng drawings, the nu-- cat'ed inlet and outlet extensions, designated 1 1 and 12 respectively. Below the extension 11 and on the same side of the cylinder an elongated vertical extension13 is'provided' which at its lower end is formed with an opening 14, registering with an inclined passageway 15 formed in the lower head 6.

Anair supply pipe 16 extends inparallelism to the cy i v the extensionll by a branch pipe 17. The pipe 16' at its lower end communicates with rider 5 and communicates with an annular valve casing 18 projecting outwardly from theex'tension 13. A valve bush 18 en earcheck valve 20 which opens into the extension 1 3 the bush.- ing 19 having an opening 21 in registry with the pi' e 16.. The casing 18 is closed at its out er en by a dome shaped cap 22. The upper ing 19 is disposed in the casillig part of the extension '13 is constructed as a casing 23 for a spring pressed valve 24 which valve normally closes an opening 25 formed in the lower wall of the casing 23, and is movable 'in'a bushing 26. The. bushing 26 is formed with an opening 27 which registers. Iwith an op-ening'28 provided in the slde of I the cylinder 5.

The uper'end of the cylinder 5 is closed by a hea 29 comprising spaced upper and lower lates 30 and 31 connected by an annular'wa 1 portion. 32 and a transverse artitioning web'33 affording inlet and out et chambe'rs 34and '35. The head 29 is constructed with an annular flange-36 circumscribin'g its lower end and forming the lower walls of extensions 37 and 38 which" register with the respective'chamber's34 and 35. The head Patented Se'pt.29,-1908'.

29' is secured u on the upperend of thecylinder 5 by he ts 39 engaged through the flanges 1-0 and 36 and held bynut's '40. .The

extension 37 has an opening41 formed'in it's' base which registers with an opening 42 formed in the top wall of the extension 11.

Similarly, the extension 38 has an opening 43 formed in its base which registers with anopening 44 formed in the upper wall of the extension 12-, Leading from the extension 12'is an air outlet pipe 45 which leads to a tank or service main (not shown). 4

The chamber 34 is provided with a. spring pressed valve 46 which works in a bushing I I 47, the latter beingin communication with the chamber 34 by means of openings 48' formed in the side thereof and in communication with the cylinder 5 by means of an 0 ening 49 formed in the lowerend thereof, w ich chamber 35 is provided with a spring inthe sides thereof, and In communication pressed valve 50 w ich works in a bushing 51, the latter being in communication with the chamber 35 by means of openings 52 formed with the cylinder 5 by means of an opening 53 formed in the lower end thereof, which opening 53 is controlled by the valve 50, the latter opening into the bushing 51.

The bushings 47and 51 constitute, in effect, casings for the respective valves 46, and

, 50 and are seated in openings 54 and 55,

formed in the respective lates 30 and 31. The openings 54are close by dome-shaped caps 56 secured to the plate 30 and having shoulders 57 which bear against and confine the bushings 47 and 51.

To the lower part of the cylinder 5, there is secured a ring-sha ed member 58 which forms the lower wal of a cylindricalwater jacket 59* having any conventional inlet and draining means (not shown), the jacket 59 being bolted to the member 58 and inclosing saidcylinder and the ipes 16 and 4 5, the said pipes passing t rough openings 60' formed 1n the top wall of the waterjacket 59. The operation will be readily apparent from the foregoing description. On the u stroke of the piston head 9, air -,or gas 1s drawn into the cylinder 5 by suction through the pi e 16, the valve casing 18, the opening 14 an the passage 15, the de ree'ofsuction being 'sufiicient to move the va ve 20 from its sea'tagainst the tension of its controlling spring. On the down stroke of the piston head 9, air or gas is drawn into the upper part of the cylinder 5 by suction through the pipe 16, the branch 17, the extensions 11 and 37, the chamber 34, the bushing 47 and they opening 49, and the charge previously admitted into the lower end 0 the cylinder is forced into the upper end of the cyhnder with the charge entering thereinto, through the,

extension 13, the casing 23, and the openings 27 and 28. Then as the head 9 moves up again, the entire charge that has been drawn in on the previous up and down strokes, is forced out of the cylinder 5 through the opening 53 bushing 51, chamber 35, extensions 38 and 12, and pipe 45. It will be understood that the valves 20 and 50 are operated on the u stroke of the piston head and are held 0 osed by the combined action of their springs, and the air pressure on the down stroke of the piston head and that the valves 24 and 46 are similarly operated on the downstroke of the piston head and are similarly held closed on the up stroke thereof. As

- shown in Fig. 1, the piston head 9 is on its downstroke and the valves 24 and 46 are operating. It will thus be seen that on the down stroke of the piston head 9, a double charge of air or gas 1s admitted into the upper part of the cylinder 5, and that on the up stroke of the piston head 9, such double 0 'arge is compressed and forced out for distribution to the service main or storage tank.

The stems of the several valves 20, 24, 46 and 50 are threaded and provided with adjustin nuts 61, whereby the tension of the contro ling springs 62 may be regulated as desired, to correspondingly regulate the degree of movement of said valves away'from their seats. Thus, the amount of'air or gas sion being in communication with the extension of said inlet chamber and the exhaust extension bein in communication with the extension of said exhaust chamber, said 0 linder being formed with an elongated in ct extension communicatin with the lower end of said cylinder and wit said cylinder at a Ipoint distant from its lower end, a piston ead working in said cylinder, an-inlet pi e connected to said inlet extensions, an out et pipe connected to said exhaust extension, a va ve arranged in said elongated inlet extension to control the communication of said inlet pipe therewith, a valve arran ed in said elongated inlet extension to contro the comrnunlcation thereof with said cylinder at the point distant from its lower end, a valve arranged in said inlet chamber to control the communication thereof with said cylinder and a valve arranged in said exhaust chamber to control the communication of said cylinder therewith, said first and fourth named valves bein operable to open position, when thepiston liead is moving in one direction, said second and third named valves bein operable to open position when the piston head is movable in a reverse direction.

In testimony whereof, I affix my signature, in presence of two witnesses.

FRED ELDER. Witnesses JOHN J. ROBBINS, FRED Lone. 

